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Dizziness: Rare, but reported occasionally, especially if injecting without eating for extended periods afterward
PMCID: PMC10853066
PMID 18444899
To absorb B12 from food or from a pill, your body needs three things working together: Stomach acid , which releases B12 from the protein it is bound to Intrinsic factor , a protein your stomach lining makes that escorts B12 through your gut A healthy small intestine , specifically the last section, where B12 is finally taken in Should even one of these three steps break down, absorbing B12 from a tablet becomes difficult
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